- 配置yum源
[root@localhost tmp.1xcFlvpxYF]# cat /etc/yum.repos.d/ceph.repo
[norch]
name=norch
baseurl=https://mirrors.aliyun.com/ceph/rpm-nautilus/el7/noarch/
enabled=1
gpgcheck=0
[x86_64]
name=x86 64
baseurl=https://mirrors.aliyun.com/ceph/rpm-nautilus/el7/x86_64/
enabled=1
gpgcheck=0
[SRPMS]
name=SRPMS
baseurl=https://mirrors.aliyun.com/ceph/rpm-nautilus/el7/SRPMS/
enabled=1
gpgcheck=0
[aarch64]
name=aarch64
baseurl=https://mirrors.aliyun.com/ceph/rpm-nautilus/el7/aarch64/
enabled=1
gpgcheck=0
- 安装librdos库
yum install libradospp-devel -y
- 示例cpp。注意:需要提前创建名为pool-1的pool
#include <rados/librados.hpp>
#include <string>
#include <list>
#include <iostream>
using namespace std;
int main(int argc, const char **argv)
{
int ret = 0 ;
// Get cluster handle and connect to cluster
std::cout<<"ceph Cluster connect begin."<<std::endl;
std::string cluster_name("ceph");
std::string user_name("client.admin");
librados::Rados cluster ;
ret = cluster.init2(user_name.c_str(), cluster_name.c_str(), 0);
if (ret < 0)
{
std::cerr << "Couldn't initialize the cluster handle! error " << ret << std::endl;
ret = EXIT_FAILURE;
return 1;
} else {
std::cout << "Created a cluster handle." << std::endl;
}
ret = cluster.conf_read_file("/etc/ceph/ceph.conf");
if (ret < 0)
{
std::cerr << "Couldn't read the Ceph configuration file! error " << ret << std::endl;
ret = EXIT_FAILURE;
return 1;
} else {
std::cout << "Read the Ceph configuration file Succeed." << std::endl;
}
ret = cluster.connect();
if (ret < 0) {
std::cerr << "Couldn't connect to cluster! error " << ret << std::endl;
ret = EXIT_FAILURE;
return 1;
}else{
std::cout << "Connected to the cluster." << std::endl;
}
std::cout<<"ceph Cluster connect end."<<std::endl;
// IO context poolname pool-1
std::cout<<"ceph Cluster create io context for pool begin."<<std::endl;
librados::IoCtx io_ctx ;
std::string pool_name("pool-1");
ret = cluster.ioctx_create(pool_name.c_str(), io_ctx);
if (ret < 0)
{
std::cerr << "Couldn't set up ioctx! error " << ret << std::endl;
exit(EXIT_FAILURE);
} else {
std::cout << "Created an ioctx for the pool." << std::endl;
}
std::cout<<"ceph Cluster create io context for pool end."<<std::endl;
// Write an object synchronously
std::cout<<"Write an object synchronously begin."<<std::endl;
librados::bufferlist bl;
std::string objectId("hw");
std::string objectContent("Hello World!");
bl.append(objectContent);
ret = io_ctx.write_full("hw", bl);
if (ret < 0) {
std::cerr << "Couldn't write object! error " << ret << std::endl;
exit(EXIT_FAILURE);
} else {
std::cout << "Wrote new object 'hw' " << std::endl;
}
std::cout<<"Write an object synchronously end."<<std::endl;
// Add an xattr to the object.
librados::bufferlist lang_bl;
lang_bl.append("en_US");
io_ctx.setxattr(objectId, "lang", lang_bl);
// Read the object back asynchronously
librados::bufferlist read_buf;
int read_len = 4194304;
//Create I/O Completion.
librados::AioCompletion *read_completion = librados::Rados::aio_create_completion();
//Send read request.
io_ctx.aio_read(objectId, read_completion, &read_buf, read_len, 0 );
// Wait for the request to complete, and print content
read_completion->wait_for_complete();
read_completion->get_return_value();
std::cout<< "Object name: " << objectId << "\n"
<< "Content: " << read_buf.c_str() << std::endl ;
// Read the xattr.
librados::bufferlist lang_res;
io_ctx.getxattr(objectId, "lang", lang_res);
std::cout<< "Object xattr: " << lang_res.c_str() << std::endl ;
// Print the list of pools
std::list<std::string> pools ;
cluster.pool_list(pools );
std::cout << "List of pools from this cluster handle" << std::endl ;
for (std::list<std::string>::iterator i = pools.begin(); i != pools.end(); ++i)
std::cout << *i << std::endl;
// Print the list of objects
// librados::ObjectIterator oit=io_ctx.objects_begin();
// librados::ObjectIterator oet=io_ctx.objects_end();
// std::cout<< "List of objects from this pool" << std::endl ;
// for(; oit!= oet; oit++ ) {
// std::cout << "\t" << oit->first << std::endl ;
// }
// Remove the xattr
io_ctx.rmxattr(objectId, "lang");
// Remove the object.
io_ctx.remove(objectId);
// Cleanup
io_ctx.close();
cluster.shutdown();
return 0 ;
}
- 编译运行
g++ -g -c cephclient.cxx -o cephclient.o -std=c++11
g++ -g cephclient.o -lrados -o cephclient
./cephclient
-
结果
image.png
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